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Huang, Zhiming; Situ, Haozhen

Optimal protection of quantum coherence in noisy environment. (English) Zbl 1358.81057

Int. J. Theor. Phys. 56, No. 2, 503-513 (2017).
Summary: In this paper, we analyse the quantum coherence dynamics of a single qubit locally interacting with a zero-temperature reservoir. We compare the behaviors of quantum coherence in Markovian and non-Markovian regime. We find that the system coherence is transferred to the reservoir and decreases with time. In non-Markovian regime, quantum coherence exists instantaneous disappearance at some discrete time points. Furthermore, we propose an optimal scheme to protect quantum coherence by executing prior weak measurement and post-measurement reversal. It is worth noticing that the scheme can get better quantum coherence with the larger weak measurement strength, while at the cost of reducing success probability.

Cited in 21 Documents

MSC:

81P45 Quantum information, communication, networks (quantum-theoretic aspects)
81S22 Open systems, reduced dynamics, master equations, decoherence
81P15 Quantum measurement theory, state operations, state preparations

Keywords:

quantum coherence; non-Markovian environment; optimal protection; weak measurement
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References:

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